What are you storing?
You're coming up with 10's of TB per year of data to store on a personal basis? I bet even Merc wasn't downloading that much. Somehow I doubt you are either. You must be shooting an awful lot of HD/UHD (or higher res) video or something.
You can't hot-swap a PCIe adapter. Why not look at one of their 12-bay rack mount units and put it in a basement?
That's tough to quantify my thoughts on that NAS without knowing your use cases. From the little information I can find, the pricing at $1500 without storage seems rather expensive given the capabilities and expandability. If you're familiar with QNAP's ecosystem then it's probably worth it for you to stick with them versus a competitor or building your own.
I was surprised that your link actually worked...Not that it is a huge difference, but the model with 4GB RAM is $1300 compared to $1500 for the 8GB model.
Maximum RAM capacity is 16GB, which makes more sense than 8GB. However, the memory slot is a Long-DIMM.
How does that socket or specs differ from the regular DDR4 RAM used on typical PC mainboards? It would nice to buy the 4GB and upgrade the RAM.
Agreed on all that. I use Synology units with 10GbE Ethernet. SSD really only makes sense when there is a queue of IOs. For single user stuff it isn't necessary. The 10GbE, though, is bad-ass.
My current home unit is a Synology DS1817+ with the RAM maxed out and a 2x 10GbE card in it. One of each of the ports go directly to the 10GbE cards in the workstations as a secondary interface (No gateway).
Write speeds. If not CPU then what?
Sure, it will help.Some of the Intel CPUs have AES acceleration.
Is that due to the Ethernet itself?
I'm not convinced if they even added the fastest Xeon processor that you would get the performance you're hoping for.